Merging upstream version 1.71.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/tests/ui/nll/issue-54302.rs b/tests/ui/nll/issue-54302.rs
new file mode 100644
index 000000000..1bfaebc38
--- /dev/null
+++ b/tests/ui/nll/issue-54302.rs
@@ -0,0 +1,19 @@
+trait Deserialize<'de> {}
+
+trait DeserializeOwned: for<'de> Deserialize<'de> {}
+impl<T> DeserializeOwned for T where T: for<'de> Deserialize<'de> {}
+
+// Based on this impl, `&'static str` only implements Deserialize<'static>.
+// It does not implement for<'de> Deserialize<'de>.
+impl<'de: 'a, 'a> Deserialize<'de> for &'a str {}
+
+fn main() {
+    // Then why does it implement DeserializeOwned? This compiles.
+    fn assert_deserialize_owned<T: DeserializeOwned>() {}
+    assert_deserialize_owned::<&'static str>();
+    //~^ ERROR not general enough
+
+    // It correctly does not implement for<'de> Deserialize<'de>.
+    //fn assert_hrtb<T: for<'de> Deserialize<'de>>() {}
+    //assert_hrtb::<&'static str>();
+}